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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include "bu/queuebuf.h"
#include "bu/sio.h"
using Bu::sio;
Bu::QueueBuf::QueueBuf( int iBlockSize /*=256*/ ) :
iBlockSize( iBlockSize ),
iReadOffset( 0 ),
iWriteOffset( 0 ),
iTotalSize( 0 )
{
}
Bu::QueueBuf::~QueueBuf()
{
for( BlockList::iterator i = lBlocks.begin(); i; i++ )
delete[] *i;
}
int Bu::QueueBuf::getSize()
{
return iTotalSize;
}
void Bu::QueueBuf::close()
{
for( BlockList::iterator i = lBlocks.begin(); i; i++ )
delete[] *i;
lBlocks.clear();
iReadOffset = iWriteOffset = iTotalSize = 0;
}
size_t Bu::QueueBuf::read( void *pRawBuf, size_t nBytes )
{
if( nBytes <= 0 )
return 0;
if( lBlocks.isEmpty() )
return 0;
size_t iLeft = nBytes;
char *pBuf = (char *)pRawBuf;
while( iLeft > 0 && iTotalSize > 0 )
{
if( iReadOffset == iBlockSize )
{
removeBlock();
if( lBlocks.isEmpty() )
{
return nBytes-iLeft;
}
iReadOffset = 0;
}
char *pBlock = lBlocks.first();
size_t iCopy = iBlockSize-iReadOffset;
if( iLeft < iCopy )
iCopy = iLeft;
if( iTotalSize < iCopy )
iCopy = iTotalSize;
memcpy( pBuf, pBlock+iReadOffset, iCopy );
iReadOffset += iCopy;
iLeft -= iCopy;
pBuf += iCopy;
iTotalSize -= iCopy;
sio << "Read " << iCopy << " bytes, new size: " << iTotalSize << sio.nl;
}
return nBytes - iLeft;
}
size_t QueueBuf::peek( void *pBuf, size_t nBytes )
{
if( nBytes <= 0 )
return 0;
if( lBlocks.isEmpty() )
return 0;
size_t iLeft = nBytes;
char *pBuf = (char *)pRawBuf;
int iTmpReadOffset = iReadOffset;
int iTmpRemSize = iTotalSize;
while( iLeft > 0 && iTmpRemSize > 0 )
{
// Switching to use temp variables instead of iReadOffset and iTotalSize
if( iReadOffset == iBlockSize )
{
if( lBlocks.isEmpty() )
{
return nBytes-iLeft;
}
iReadOffset = 0;
}
char *pBlock = lBlocks.first();
size_t iCopy = iBlockSize-iReadOffset;
if( iLeft < iCopy )
iCopy = iLeft;
if( iTotalSize < iCopy )
iCopy = iTotalSize;
memcpy( pBuf, pBlock+iReadOffset, iCopy );
iReadOffset += iCopy;
iLeft -= iCopy;
pBuf += iCopy;
iTotalSize -= iCopy;
sio << "Read " << iCopy << " bytes, new size: " << iTotalSize << sio.nl;
}
return nBytes - iLeft;
}
size_t Bu::QueueBuf::write( const void *pRawBuf, size_t nBytes )
{
if( nBytes <= 0 )
return 0;
if( lBlocks.isEmpty() )
{
addBlock();
iWriteOffset = 0;
}
size_t iLeft = nBytes;
const char *pBuf = (const char *)pRawBuf;
while( iLeft > 0 )
{
if( iWriteOffset == iBlockSize )
{
addBlock();
iWriteOffset = 0;
}
char *pBlock = lBlocks.last();
size_t iCopy = iBlockSize-iWriteOffset;
if( iLeft < iCopy )
iCopy = iLeft;
memcpy( pBlock+iWriteOffset, pBuf, iCopy );
iWriteOffset += iCopy;
iLeft -= iCopy;
pBuf += iCopy;
iTotalSize += iCopy;
sio << "Wrote " << iCopy << " bytes, new size: " << iTotalSize << sio.nl;
}
return nBytes;
}
long Bu::QueueBuf::tell()
{
return -1;
}
void Bu::QueueBuf::seek( long )
{
}
void Bu::QueueBuf::setPos( long )
{
}
void Bu::QueueBuf::setPosEnd( long )
{
}
bool Bu::QueueBuf::isEos()
{
return iTotalSize == 0;
}
bool Bu::QueueBuf::isOpen()
{
return true;
}
void Bu::QueueBuf::flush()
{
}
bool Bu::QueueBuf::canRead()
{
return iTotalSize > 0;
}
bool Bu::QueueBuf::canWrite()
{
return true;
}
bool Bu::QueueBuf::isReadable()
{
return true;
}
bool Bu::QueueBuf::isWritable()
{
return true;
}
bool Bu::QueueBuf::isSeekable()
{
return false;
}
bool Bu::QueueBuf::isBlocking()
{
return false;
}
void Bu::QueueBuf::setBlocking( bool )
{
}
void Bu::QueueBuf::addBlock()
{
lBlocks.append( new char[iBlockSize] );
sio << "Added new block." << sio.nl;
}
void Bu::QueueBuf::removeBlock()
{
delete[] lBlocks.first();
lBlocks.erase( lBlocks.begin() );
sio << "Removed block." << sio.nl;
}
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